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Closed-circuit television (CCTV), with known as video surveillance, is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors. It differs from spread around television in that the signal is not openly transmitted, even if it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. though all but all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require new security or ongoing monitoring. even if videotelephony is seldom called "CCTV" one exception is the use of video in estrange education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas concerning the world. In recent years, the use of body worn video cameras has been introduced as a additional form of surveillance, often used in deed enforcement, once cameras located upon a police officer's chest or head. Video surveillance has generated significant debate more or less balancing its use later individuals' right to privacy even with in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central govern room, for example as soon as the character is not gratifying for humans. CCTV systems may produce a result for all time or by yourself as required to monitor a particular event. A more advanced form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, like a variety of quality and operate options and extra features (such as leisure interest detection and email alerts). More recently, decentralized IP cameras, perhaps equipped taking into account megapixel sensors, sustain recording directly to network-attached storage devices, or internal flash for utterly stand-alone operation.

By one estimate, there will be approximately 1 billion surveillance cameras in-use worldwide by 2021. roughly 65% of these cameras are installed in Asia. The increase of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant bump in permit surveillance, a substantial rise in the methods of broadminded social monitoring and control, and a host of crime prevention trial throughout the world.

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